
48
TOS5300_INTERFACE
IEEE 488.2 Register Model
Status byte register
The status byte register stores STB and RQS (MSS) messages as defined by the IEEE 488.1 standard.
The status byte register can be read by using IEEE 488.1 serial polling or the IEEE 488.2 common
command *STB?.
When the controller executes serial polling, bit 6 responds with request service (RQS). The status
byte value is not changed by serial polling.
*STB? makes the TOS5300 Series transmit the contents of the status byte register and the master
status summary (MSS) message.
*STB? does not change the status byte, MSS, and RQS.
Bit
Bit
weight
Bit name
Description
0
1
Reserved
Reserved for future use by IEEE 488. The bit value is
notified as zero.
1
2
Reserved
2
4
Error/Event Queue (EEQ)
If data exists in the error/event queue, this bit is set
to true.
3
8
Questionable Status Register
(QUES)
This bit is set to true when a bit is set in the
QUEStionable event status register and the
corresponding bit in the QUEStionable status
enable register is true.
4
16
Message Available (MAV)
This bit is set to true when a request is received from
the digital programming interface and the TOS5300
Series is ready to generate the data byte.
5
32
Standard Event Status Bit
Summary (ESB)
This bit is set to true when a bit is set in the event
status register.
6
64
Request Service (RQS)
This bit is set to true when a bit is set in the service
request enable register and the corresponding bit
exists in the status byte.
The SRQ line of the USB is set.
Master Status Summary (MSS)
This bit is set to true when any bit in the status byte
register is set to 1 and the corresponding bit in the
service request enable register is set to 1.
7
128
Operation Status Register (OPER)
This bit is set to true when a bit is set in the
OPERation event status register and the
corresponding bit in the OPERation status enable
register is set.
8-15
—
NOT USED
—
Содержание TOS5300
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